Later on when Thoughtly has added their SIP trunk, I can give you other Thoughtly customers a hint on where to get numbers and using a massively simpler onboarding. It's a Bulgarian telecom company called Zadarma. I found them through a post at Reddit.
I am still waiting for my number with Twilio. It's been almost 3 months now, despite the help from Thoughtly. Zadarma verified me within 3 hours.
Here is their price plan for numbers:
https://zadarma.com/en/tariffs/numbers/